Improvement in furnaces for roasting ores



Hmmm) 'JULZ w71 [.Hllllllll IIIIIIIIIIUlI lin JIIHII IIIIIIIIIIIII'IIIIIIIIIHIIIHIlill] UNITED STATES PATENT OEEIGE.v

v STEPHEN F. AMBLER, OF MONITOR, lCALIFORNIA IMPROVEMENT lN'FURNACES FOR sROSYTING ORES.

Specification forming part of Letters Patent No. 117,360, dated July 25, 1871.

' make and use 'my said invention or improvements Without further invention or experiment.

My invention relates to what I call-a compound blow-pipe furnace to be used for smelting and roasting ores; and it consists, lirst, of a carbonizng-chamber, in which the Wood is placed and converted into charcoal before it reaches the fires to be used as fuel. Two pipes lead into this furnace through which a blast oi' air is driven, one of them being so arranged as to give an oxidizing heat While the-other gives a reducing heat. Connected with this chamber is the reducing-tube, into which` the ore is fed, and

-through which the heat from the carbonizngchamberpasses, carrying the ore with it into a revolving cylinder, Which is connected With the opposite end of the-tube.

Q In order to more fully illustrate and explain my invention, reference is had to the accompanylug drawing forming a part of this speciiication, in which- Figure 1 is a side elevation of my furnace. Fig. 2 is a plan. Fig. 3 is an end view A represents the furnace, which is constructed of brick, in the usual manner of constructing furnaces, and is provided with the grate l5. The space E above this grate is What I call a carbonizing-chamber. This chamber is kept constantly iilled with Wood, which is fed through the doors C and l). When the doors are closed the Wood in the upper part of the furnace will be carbonized or converted into charcoal, and, as the fire below burns out,'the charred or carbonized Wood will settle down and continually feed the fire. At the back of the chamber E is a hot-air chamber, F, into which the heat and flame from the chamber E pass, throughthe iiue g.

`j A blast-pipe, h, enters the chamber F at aboutv an equal height with the flue g, While a branch pipe, i., passes to the front and enters the chamvber E, so as to deliver its blast directly upon the tire on the grate. The blasts from these pipes are regulated by dampersjj.` When the damper j ofthe pipe h is closed and the damper j opened, the blast will be delivered upon the grate and a reducing llame will'y be produced, which will pass through the iiue g into the chamberF, and when the damper j is opened oxygen Will be supplied to the chamber F and an oxidizing heat produced.

Communication with the chamber F, directly opposite the blast-pipe h, is a reducing-tube, K, into which the ore is fed through a hopper, L. I his tube is made of cast-,iron and lined with rebrick', so as to resist the action of the heat. The

opposite end of the reducing-tube communicates With a revolving roasting-cylinder, M, so that as the ore meets the blast and heat from the cha1n ber F it Will be carried into the revolving cylinder, and there subjected to heat and roasted in passing through the cylinder. Directly below the hopper L is an opening or tube, N, through which any lead which may become separated or smelted by the heat .can be dravm o. By this means I provide a blow-pipe action upon the ores which will eii'ectually calcine them.

Having thus described my invention, what I claim, and desire to secure by Letters Patent,

1. In combination with the furnace A having the carbonizingchamber E and hot-air chamber F, the blast-pipes h and t, substantially as and for the purpose above described. 2. The reducing-tube K, connecting the hotair chamber F and revolving roasting-cylinder M, substantially as and for the purpose above described. A

3. The above-described process of feeding the Wood into a closed chamber, Where it will be subjected to heat Without air, and fed to the fire in the manner and 'for the purpose above described.

In witness whereof I have hereunto set my hand and seal. v

- STEPHEN F. AMBLER. [1.. s]

` Vitnesses:

SYLvEsTEn SAWYER, 0. F. THORNTON, 

